HA40 4-Channel Controller
3.1.2 Optional Analog Input PCB
(P/N 10-0221)
Transmitter input PCB option # 10-0298, shown in Figure 3-3, is available for interfacing the HA40 to field transmitters with 4-20mA or voltage outputs (0-2 VDC max). TB1 & TB2 provide Channel 24VDC, HI and LO terminals for receiving analog inputs. R1, R2, R3, & R4 are 100 ohm precision socketed termination resistors connected between each channel’s HI & LO input terminals. These may be removed if voltage inputs are to be applied. Figure 3-4 shows correct wiring for both 2-wire and 3-wire transmitters.
TB3 provides the dedicated failsafe-5 amp-form C common FAULT relay.
Figure 3-4. Wiring for 2- and 3-wire Transmitters
3.1.3 Optional Discrete Relay PCB’s
(P/N 10-0222)
The optional Discrete Relay PCB, shown in Figure 3-5, adds six 5 amp form C relays. Each relay is fully programmable as described in Section 2.3.1. Many HA40 applications utilize the standard equipped Relay 1 / Relay 2 (see Section 2.3.1) and do not require optional discrete relays
Warning
All mechanical (dry contact) relays are rated at 5 Amp for 28 VDC and 250 ~VAC RESISTIVE loads. IMPORTANT: Appropriate diode (DC loads) or MOV (AC loads) snubber devices must be installed with inductive loads to prevent RFI noise spikes.
AC or DC power supplies to relays on the 10-0222 Discrete Relay PCB option must be the same for each relay. Example: 24VDC should not be the power switched by one relay and 115VAC by others.
Figure 3-3. Optional Analog Input PCB (P/N 10-0221)
HA40 Technical Manual | 3-4 | Revision 1 (08/08) |
